That question is a very broad one. Blades like the Khopesh and Falcata have forward curving blades.
Swords like the Sabre and the Scimitar are back-curving.
Some swords like the Katana are lightly curved, whereas a Scimitar for example would usually have a more severe curvature.
There are a lot of different types of curved swords around the world. One of the most famous would be the Japanese Samurai sword, or katana. But there are also falchions, grosse messers, a large variety of sabers, cutlasses, scimitars, chinese broadswords (also known as Dao), kukri's, falcata's, and kopis's. Those are the main ones I can think of off the top of my head.
It depends greatly on where it's from, but the popular curved swords are either Scimitars or Falchions. (I think I spelt it wrong)
The grim reaper does not use a sword, he uses a curved bladed weapon called a "Scythe."
The most common name for a curved sword is the scimar which was developed by the persians. The saber is also a curved sword - usually used by cavalry troops.
scimitars for sure i found it in the text
The Saber sword is used only by army officer, because it is one edged with curved blade and a hand guard. The Marines use the Marine Officer Sword, so called because despite it's curved blade it has no hand guard.
The sword often used by sailors is a cutlass, a curved sword.
Entirely depends on the nation and the type of sword.the Japanese curved blades are called wakizachi, katana, and no-dachi respectively for a short, normal length, and extra long version respectively.A chinese curved sword is commonly called the daoon the indian subcontinent, the Talwar is curved, while in afghanistan, the Pulwar is of the same basic shape.In the middle east, the shamshir, also commonly called a scimitar was curved, as were the kilij and saif. It may be noted at this point that the image of the "curved arabic scimitar vs the straight knightly sword" during the Crusades is in fact myth; the arabic swords of the medieval age were in fact straight. The first curved islamic swords appear among the mamluks in the 14th century, long after the crusades ended.In eastern europe, the hungarian or Avar sabre was commonly curved.in western europe, many falchion were likewise curved swords, as were the later cavalry sabre and cutlass.(A number of african and indonesian sword types also existed with curved forms, but I'm afraid I cant give names for them.)Original answer:A samurai sword
sabre
Scimitar (arabian), Sabre( european- chinese), Curved Cutlass (european), Butterfly swords (chinese), Katana (japan). Which one?!
A scimitar is a curved sword used in combat.
A cutlass is a short , slightly curved sword.
Jian 劍 Chinese Straight Sword Dao 刀 Chinese Curved Sword/Saber
Thresh took a curved sword. That i would think is a machete called a "kukri."